@JPSabq
Our traveling party is typically made up exclusively of adults - and we have no end of fun on every trip! I tell friends and family who think I'm crazy for going to WDW as an adult that it's the only place in the world where I get to act my shoe size and forget my age!
The wonder and Magic are still there for us adults, I promise! And the great thing about going without kiddos tagging along is that you can do things (like spend an entire day going through World Showcase at a leisurely pace, or go to Fireworks Dessert Parties and enjoy an adult beverage) without worrying about little ones tiring out, or getting bored with your more deliberate pace.
I would suggest that you create a list of things you could do together as a couple - don't forget to include a bit of romance!
and remember that Disney Springs (formerly Downtown Disney) is now a day-long shopping and dining "experience" of it's own! You can ride water taxis back and forth, and there are so many new restaurants and shops to explore... and you don't have to buy a Park ticket for that!
Pick your favorite Resort - or try a new one - and then rent an ECV, and go have fun! One of the great joys of having adult children is that you get to re-visit those early days of your courtship and marriage before kids; it's great!
Use the SEARCH box that you will find towards the top right of every page here on the DISboards to look for posts with information - there's TONS of advice here on first-time ECV tips, and lots of discussion about who to rent from, and when to have the unit delivered...
Don't forget: if you will be flying in, many airports have long walks between gates and/or concourses. You may want to consider assistance for the airport. You can also bring along a Rollator (which is like a walker with a built in seat) and it will travel for free as medical equipment when you fly.
Good luck! I hope to hear all about your next WDW adventure!